Species
* '' X. americanus'' (Westwood, 1852) * '' X. luscinus'' (Howden, 1968) * '' X. musculus'' (Say, 1835) * '' X. planifrons'' (Schaeffer, 1906) * '' X. simplex'' (LeConte, 1854) * '' X. ulkei'' (Horn, 1876)References
Further reading
* Arnett, R.H. Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). (2002). ''American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea''. CRC Press LLC, Boca Raton, FL. * * Richard E. White. (1983). ''Peterson Field Guides: Beetles''. Houghton Mifflin Company. Scarabaeoidea genera {{Scarabaeoidea-stub